*Excludes Observations that spanned multiple years

Pre 19700
19701
19710
19722
19730
19740
19750
19760
19770
19781
19790
19800
19810
19821
19831
19840
19851
19862
19874
198834
198925
199040
199193
199231
199350
199444
199533
199620
199737
199830
199912
20006
200119
20028
200310
200418
200511
20064
20074
20084
20091
20106
20117
20123
20130
20140
20151
20162
20171
20180
Total567