*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19735
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19872
19883
19891
19901
199121
19920
19931
19941
19950
19960
19970
19981
19990
20002
20010
20020
20031
20041
20051
20066
20078
20080
20092
20100
20111
20120
20131
20142
20153
20163
20175
20180
20190
Total74