*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19862
19870
19880
19891
19900
19911
19920
19930
19940
19951
19960
19978
19980
19992
20003
20013
20023
20032
20044
20050
20060
20071
20082
20090
20100
20110
20120
20131
20140
20150
20160
20170
Total35