*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19752
19763
19776
19780
19791
19802
19819
19820
19831
19841
19850
19862
19870
19880
19891
19900
19910
199221
199320
199413
19953
19961
199770
19980
19991
20000
200161
20020
200356
20040
20050
20062
20070
20080
20090
201057
201146
20123
201361
201448
201527
201655
201782
201862
201967
20200
20210
20220
Total784