*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19874
19880
19890
19900
19910
19920
19931
19940
19951
19960
19970
19980
19994
20000
20011
20021
20031
20040
20050
20060
20071
20085
20090
201038
201145
20128
20135
20147
20150
20160
20170
Total124