*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19870
19880
19890
19900
19911
19920
19938
19940
19951
19964
19971
19980
19990
20000
20010
20022
20030
20040
20050
20060
20070
20087
20090
201019
201143
20120
20132
20144
20150
20161
20170
Total94