*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19970
19980
19990
20000
20011
20026
200312
20040
20059
20063
20078
200821
20090
20105
20112
20124
20131
20140
20152
20165
20172
20180
20190
20200
20210
20220
20230
20240
Total81