|
Year
|
Iowa
|
Pennsylvania
|
|
|
|
|
1960
|
656
|
11,203
|
|
1961
|
643
|
11,223
|
|
1962
|
559
|
11,856
|
|
1963
|
629
|
12,678
|
|
1964
|
1,007
|
14,162
|
|
1965
|
1,067
|
16,384
|
|
1966
|
1,214
|
15,169
|
|
1967
|
1,608
|
16,119
|
|
1968
|
1,882
|
20,710
|
|
1969
|
1,918
|
22,887
|
|
1970
|
2,241
|
25,970
|
|
1971
|
2,822
|
31,917
|
|
1972
|
2,519
|
33,052
|
|
1973
|
2,970
|
32,397
|
|
1974
|
3,455
|
37,281
|
|
1975
|
4,039
|
38,933
|
|
1976
|
3,813
|
34,985
|
|
1977
|
4,145
|
33,328
|
|
1978
|
4,674
|
35,381
|
|
1979
|
5,259
|
39,133
|
|
1980
|
5,826
|
43,032
|
|
1981
|
5,915
|
44,104
|
|
1982
|
5,018
|
42,767
|
|
1983
|
5,262
|
40,782
|
|
1984
|
5,781
|
38,154
|
|
1985
|
6,106
|
39,240
|
|
1986
|
6,703
|
42,629
|
|
1987
|
6,553
|
44,087
|
|
1988
|
7,279
|
43,534
|
|
1989
|
7,563
|
45,586
|
|
1990
|
8,321
|
51,213
|
|
1991
|
8,477
|
53,824
|
|
1992
|
7,816
|
51,276
|
|
1993
|
9,159
|
50,295
|
|
1994
|
8,914
|
51,425
|
|
1995
|
10,071
|
51,586
|
|
1996
|
7,771
|
57,905
|
|
1997
|
8,841
|
53,140
|
|
1998
|
8,916
|
50,470
|
|
1999
|
8,034
|
50,431
|
|
2000
|
7,796
|
51,584
|
|
2001
|
7,865
|
50,432
|
|
2002
|
8,388
|
49,578
|
|
2003
|
8,175
|
49,210
|
|
2004
|
8,003
|
50,998
|
| more... |
more... |
more... |
|
|
OK to share with attribution
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