*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19753
19762
19770
19780
19791
19800
19810
19820
19831
19840
19850
19860
19871
19880
19893
19904
19914
19924
19932
19946
19958
19967
19976
19984
19992
20000
20011
20020
20036
20047
200511
20062
200710
200815
200922
201020
201117
201221
201325
201411
201512
201615
20172
20180
20190
20206
20212
20224
20232
20242
Total272