*Excludes Observations that spanned multiple years

Pre 197016
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19841
19850
19862
19870
19881
19891
19900
19910
19920
19930
19940
19950
19960
19970
19984
19991
200061
20010
20022
20035
20042
20050
20062
20075
20081
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total104