*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19832
19840
19850
19860
19872
19883
19894
199010
199114
199212
19934
19944
19950
19960
19970
19980
199910
20006
20013
20023
20033
20041
20050
20060
20072
20085
20091
20100
20113
20123
20132
20143
20151
20165
20176
20180
Total112