*Excludes Observations that spanned multiple years

Pre 19705
19700
19710
19722
197372
1974276
1975276
1976228
197736
1978132
1979120
198096
198172
198260
1983132
1984180
1985168
198696
1987108
198884
198953
199051
199136
199249
199312
199451
199528
199640
199754
199864
199966
200047
200133
200253
200354
200459
200561
200643
200755
200831
200956
201057
201168
201263
201365
20144
20151
20160
20170
Total3397