*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19874
19881
19891
19901
19911
19923
19930
19940
19953
19961
19976
19981
19991
20001
20013
20022
20030
20040
20051
20060
20070
20081
20092
20100
20111
20120
20131
20142
20151
20162
20171
20180
Total41