*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19772
19780
19791
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19921
19932
19941
19950
19960
19972
199824
19990
20000
200115
20020
20030
20040
20050
20060
20070
20080
20090
20108
20118
20120
20130
20140
20150
20161
20177
201839
20195
20200
20210
20220
Total116