*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19822
19830
19840
19853
19861
19873
19880
19891
19900
19910
19920
19930
19940
19950
19960
19972
19980
19990
20008
20018
20021
20030
20040
20050
20061
20070
20080
20090
20100
20110
20120
20130
20141
20152
20163
20170
20180
Total42