*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19862
19870
19880
19891
19900
19911
19921
19931
19940
19951
19963
199715
19980
19996
20000
20010
20020
20030
20040
20051
20062
20071
20082
20092
201012
201127
20124
201311
20147
20152
20163
20173
20180
Total110