*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19783
19790
19800
19810
19820
19830
19840
19854
19861
19875
19881
19891
19903
19910
19920
19930
19941
19957
19960
19970
19980
19990
20000
20011
20020
20030
20040
20050
20061
20073
20080
20091
20101
20110
20121
20131
20140
20153
20164
20174
20182
20190
20200
Total48