No. of dwellings	Year of construction (aggregate)	Total
Total	Total	9,730,999
Total	Before 1900	793,401
Total	From 1900 to 1920	366,416
Total	From 1921 to 1940	431,216
Total	From 1941 to 1950	481,269
Total	From 1951 to 1960	863,630
Total	From 1961 to 1970	1,052,009
Total	From 1971 to 1980	1,495,132
Total	From 1981 to 1990	1,360,191
Total	From 1991 to 2001	1,417,202
Total	From 2002 to 2011	1,470,533
1	Total	7,701,066
1	Before 1900	697,546
1	From 1900 to 1920	307,447
1	From 1921 to 1940	353,495
1	From 1941 to 1950	394,023
1	From 1951 to 1960	676,965
1	From 1961 to 1970	735,461
1	From 1971 to 1980	1,093,484
1	From 1981 to 1990	1,088,687
1	From 1991 to 2001	1,135,947
1	From 2002 to 2011	1,218,011
2	Total	651,034
2	Before 1900	45,136
2	From 1900 to 1920	25,879
2	From 1921 to 1940	35,329
2	From 1941 to 1950	38,859
2	From 1951 to 1960	68,120
2	From 1961 to 1970	91,475
2	From 1971 to 1980	119,740
2	From 1981 to 1990	98,937
2	From 1991 to 2001	85,021
2	From 2002 to 2011	42,538
3	Total	202,023
3	Before 1900	14,450
3	From 1900 to 1920	8,294
3	From 1921 to 1940	10,671
3	From 1941 to 1950	11,674
3	From 1951 to 1960	20,678
3	From 1961 to 1970	30,195
3	From 1971 to 1980	38,839
3	From 1981 to 1990	28,855
3	From 1991 to 2001	24,841
3	From 2002 to 2011	13,526
4	Total	140,755
4	Before 1900	8,657
4	From 1900 to 1920	5,068
4	From 1921 to 1940	6,216
4	From 1941 to 1950	7,261
4	From 1951 to 1960	14,569
4	From 1961 to 1970	19,937
4	From 1971 to 1980	24,462
4	From 1981 to 1990	18,916
4	From 1991 to 2001	20,433
4	From 2002 to 2011	15,236
5 to 9	Total	412,664
5 to 9	Before 1900	16,445
5 to 9	From 1900 to 1920	9,841
5 to 9	From 1921 to 1940	12,244
5 to 9	From 1941 to 1950	15,257
5 to 9	From 1951 to 1960	40,161
5 to 9	From 1961 to 1970	59,796
5 to 9	From 1971 to 1980	75,092
5 to 9	From 1981 to 1990	54,337
5 to 9	From 1991 to 2001	66,281
5 to 9	From 2002 to 2011	63,210
10 to 19	Total	398,959
10 to 19	Before 1900	9,044
10 to 19	From 1900 to 1920	7,503
10 to 19	From 1921 to 1940	9,283
10 to 19	From 1941 to 1950	10,399
10 to 19	From 1951 to 1960	31,472
10 to 19	From 1961 to 1970	70,821
10 to 19	From 1971 to 1980	80,616
10 to 19	From 1981 to 1990	44,153
10 to 19	From 1991 to 2001	59,203
10 to 19	From 2002 to 2011	76,465
20 to 29	Total	131,068
20 to 29	Before 1900	1,515
20 to 29	From 1900 to 1920	1,653
20 to 29	From 1921 to 1940	2,462
20 to 29	From 1941 to 1950	2,367
20 to 29	From 1951 to 1960	7,521
20 to 29	From 1961 to 1970	27,403
20 to 29	From 1971 to 1980	32,887
20 to 29	From 1981 to 1990	14,421
20 to 29	From 1991 to 2001	16,178
20 to 29	From 2002 to 2011	24,661
30 to 39	Total	47,853
30 to 39	Before 1900	386
30 to 39	From 1900 to 1920	441
30 to 39	From 1921 to 1940	905
30 to 39	From 1941 to 1950	892
30 to 39	From 1951 to 1960	2,524
30 to 39	From 1961 to 1970	8,924
30 to 39	From 1971 to 1980	14,771
30 to 39	From 1981 to 1990	5,979
30 to 39	From 1991 to 2001	4,980
30 to 39	From 2002 to 2011	8,051
40 or over	Total	45,577
40 or over	Before 1900	222
40 or over	From 1900 to 1920	290
40 or over	From 1921 to 1940	611
40 or over	From 1941 to 1950	537
40 or over	From 1951 to 1960	1,620
40 or over	From 1961 to 1970	7,997
40 or over	From 1971 to 1980	15,241
40 or over	From 1981 to 1990	5,906
40 or over	From 1991 to 2001	4,318
40 or over	From 2002 to 2011	8,835