*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19721
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19844
19850
19866
19877
198811
198918
19907
199117
19924
19935
19946
19954
19966
199716
199824
199915
20008
20018
20022
20035
20043
20050
20060
20070
20083
200912
20100
20110
20121
20130
20142
20151
20162
20171
20180
Total199