*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19720
19730
19740
19751
19760
19773
19780
19791
19801
19810
19820
19830
19840
19851
19860
19870
19887
19893
19900
1991166
1992117
199311
19944
199544
19960
19970
19986
19992
20000
20019
200212
20033
20046
20050
200610
20070
20080
20090
20103
201133
20127
201312
201462
201563
201660
201714
201822
201987
20200
Total771