*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19722
19739
19740
19750
19760
19771
19780
19790
19800
19810
19820
19833
198435
198513
19868
198743
198864
198913
199063
199171
199238
199363
19946
19955
19962
19971
19984
199934
200075
200133
200216
20034
20040
200525
20062
20073
200813
20091
20105
20117
20120
20130
20141
20150
20165
20171
20181
20190
Total670