Unlike other Indian states/union territories, Delhi was not having the same status from 1951. In 1951 Delhi was a Part-C state and “Chaudhary Brahm Prakash” became the first chief minister of Delhi. In 1956, it was made as a Union territory under the direct control of President of India. In 1966 the assembly was replaced by “Delhi Metropolitan Council” which is completely controlled by the Governor of Delhi and the council had no legislative powers. In 1991 the council was replaced by Delhi legislative assembly and the “union territory of Delhi” was formally called as National Capital Territory of Delhi (NCT of Delhi). NCT of Delhi is a union territory and it has its own legislature like Puducherry.
Below is the time-line of the status of "NCT of Delhi":
1951 to 1956 – Part-C state (had only one election in 1951)
1956 to 1966 – Union territory under the direct control of President of India (had no election in this period)
1966 to 1990 – Delhi Metropolitan council under the direct control of Governor of Delhi (had three elections in 1972, 1977 & 1983)
From 1991 – Formally known as NCT of Delhi which is an union territory and has its own legislatures (had 6 elections in 1993, 1998, 2003, 2008, 2013 & 2015)
Under the rule of Legislative constituency, out of 32 years (1952-1956 & 1993-2019)
INC (Indian National Congress) ruled for 20 years (1952-1956 & 1998-2013)
BJP (Bharatiya Janata Party) ruled for 5 years (1993-1998)
AAP (Aam Aadmi Party) ruled for 7 years (2013–2019)
Under the rule of Delhi Metropolitan council, INC got the majority in 1972 & 1983 elections & JNP (Janata Party) got the majority in 1977 election.
In 1951 election, Delhi had 42 constituencies out of which 6 were dual member constituency & 36 were single member constituency. After the abolition of dual member constituency act in 1961, Delhi had 56 constituencies. From 1993 election NCT of Delhi has 70 constituencies till date.
If you look at the bar chart (Electors/Voters), the average increase in electors is calculated to 27% E-YoY (approximately), which is approximately 14% higher growth when compared to India’s average elector's growth of 13%.
The average polling percentage for NCT of Delhi falls at 59.5%, which is approximately 0.5% lower when compared to India’s average polling percentage of 60%. The above mentioned average values are calculated without considering 1951 data, since there was a major change in elector’s data from 1951 to 1972. The total voters in the bar chart for the year 1951 were back-calculated from reported polling percentage, since NCT of Delhi had dual member & single-member constituencies.
For better understanding:
1977 JNP (Janata Party) data was considered as BJP in this line chart. 1951 & 1972 BJS (Bharatiya Jana Sangh) data was considered as BJP in this line chart.
The three major national parties INC, BJP & BSP with one state party AAP were taken in to consideration for the "Vote share"/"Vote bank" line chart of NCT of Delhi. Remaining all other parties were having less than 5% vote bank.
There was a minor drop in vote bank for INC in the year 1977 and chart shows that there is a considerable decline of INC vote bank from the year 2008.
There was a minor drop in vote bank for BJP in the year 1983 & 1998, but BJP is growing at a steady state from the beginning.
BSP had good start and they were growing slowly up to 2008, but they have got very less votes in the year 2015.
AAP is the first state level party which came in to power in 2013. When there was a high competition between INC, BJP & BSP, It was a great start for AAP and the growth was extraordinary.
1951 male/female voting values are not available; hence we have taken data from the year 1972. The line chart clearly shows that the male & female voting percentage is travelling parallel to each other. Always female voting percentage is slightly lesser than male voting percentage.
The average percentage of male voters is calculated to 60.29%, which is just 0.29% higher when compared to India’s average polling percentage of 60%. The average percentage of female voters is calculated to 58.23%, which is 1.77% lower when compared to India’s average polling percentage of 60%.