*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19850
19860
19874
19880
19890
19900
19910
19920
19931
19941
19952
19962
19970
199812
19992
20000
20018
20020
20035
20042
20051
20060
20071
20087
20091
201020
201126
20120
20130
20141
20150
20161
20170
Total98