*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19941
19957
19965
19974
19980
19992
20003
20010
20024
20030
20040
20050
20060
20070
20080
20092
20100
20110
20120
20130
20140
20150
20161
20170
Total29