*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19730
19740
19751
19760
19770
19780
19792
19801
19810
19820
19832
19844
19850
19863
19870
19880
19890
19901
199122
19922
199327
19944
199522
19962
19970
19981
19990
20000
20015
20020
20039
20040
20050
20063
20070
20084
200912
20105
201111
20121
20130
20141
20153
20165
201731
201811
201914
20200
Total210