*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19732
19742
19750
19760
19771
19780
19791
19800
19811
19823
19832
19842
19853
19860
19870
19880
19892
19900
19910
19920
19931
19941
19950
19960
19970
19980
19990
20001
20010
20020
20030
20040
20050
20061
20070
20081
20091
20105
20115
20121
20131
20141
20151
20161
20171
20181
20190
20200
Total42