*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19861
19875
198819
19894
19908
19916
19927
19935
19943
199515
19967
199716
199810
199912
200011
20012
20021
200343
200424
20059
20066
20076
20085
20093
20103
20112
20128
201314
201414
20156
201614
20175
20180
Total294