*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
20010
20020
20030
20040
200536
200643
200746
200823
20090
201030
201138
20125
20136
201423
20157
20168
201710
20180
20190
20200
20210
20220
20230
20240
Total275