*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197224
197327
19740
19750
19760
19770
19780
19790
19802
19810
19820
19830
19840
19850
19860
19870
19881
19893
19905
19913
19920
19931
19942
19950
19960
19970
19980
199911
20007
20019
20020
20031
20040
20051
20060
20070
20087
20090
20100
20111
20120
20130
20140
20150
20160
20171
20181
20190
Total107