*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
2005136
2006107
200783
200839
20090
201016
201130
201234
201359
201424
201573
201680
201761
201829
201922
20200
20210
20220
20230
20240
Total793