*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19869
19876
19880
19893
19901
19911
19925
199319
199414
199521
19962
199714
199813
199933
20006
20016
20028
20035
20046
200516
20069
20074
200810
20096
201016
201125
201223
201314
20149
201511
201614
201710
20180
Total340