*Excludes Observations that spanned multiple years

Pre 19701
19700
19712
19720
19730
19740
19750
19760
19770
19781
19791
19800
19810
19820
19830
19841
19851
198625
198737
1988105
198910
199025
199154
199210
199329
199410
199526
19965
199715
19980
199950
200033
20017
200217
20033
20043
20051
20062
20071
20088
20095
20106
20113
20120
20135
20140
20151
20166
20176
20188
201923
202017
202132
202220
202352
20242
Total669