*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19732
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19840
19854
19864
19874
19881
19894
19900
19910
19920
19931
19940
19950
19960
19970
19983
19991
20000
20015
20020
20030
20040
20050
20060
20070
20083
20090
201018
201112
20124
20130
2014110
201540
201682
20172
201843
20190
Total344