*Excludes Observations that spanned multiple years

Pre 19700
19700
19711
19720
19735
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19874
198817
19891
19901
199121
19921
19933
19941
19951
19960
19970
19981
19990
20002
20010
20029
20031
20041
20051
20066
20078
20080
20092
20100
20111
20120
20131
20142
20153
20163
20175
20181
20190
20200
Total105