*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19792
19800
19810
19820
19830
19840
19850
19862
19870
19884
19891
19901
19913
19922
199313
19941
199512
19962
19973
19980
19992
20001
20010
200214
20030
20041
20052
20060
20074
20085
20097
20100
20112
20120
20135
20143
20151
20165
20175
201817
201915
20207
202124
202210
Total176