*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19890
19909
19916
19928
19937
19940
19950
19960
19970
19980
19990
20001
20010
20020
20030
20041
20050
20060
20070
20080
20092
20101
20112
20121
20130
20142
20150
20162
20170
20180
20190
Total44