*Excludes Observations that spanned multiple years

Pre 19700
19700
19712
197222
197320
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
198610
198712
198823
198917
199011
199110
199215
19931
19943
19952
19960
19971
19982
199936
200036
200124
20027
20031
20041
20050
20062
20074
20085
20090
20102
20114
20121
20130
20140
20150
20167
20174
20183
20190
Total289