*Excludes Observations that spanned multiple years

Pre 19700
19700
19713
19720
19730
19740
19750
19760
19770
19781
19790
19800
19811
19820
19835
19840
19850
198620
19871
19880
19891
19903
19912
199219
199312
19945
199518
19960
199712
19980
19990
20001
200110
20022
20030
200412
20056
20062
20071
20082
20090
20102
20110
20120
20130
20142
20153
20161
20170
Total147