*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19726
19731
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19844
198511
19860
19873
19885
19890
19901
199110
199230
19931
19940
19950
19961
19970
19980
19990
20000
20010
20020
20030
20040
20050
20060
20070
20080
20091
20100
20112
20120
20132
20141
20151
20163
20172
20180
20190
Total85