*Excludes Observations that spanned multiple years

Pre 19700
19700
19712
197253
197325
19741
19750
19760
19773
19780
19790
19800
19810
19820
19830
19840
19857
198682
198795
1988107
198930
199043
199164
199212
19937
199429
199573
199650
1997114
199813
199980
200087
200156
200219
20039
20044
20053
20067
20079
200810
20099
20104
20114
201212
20139
201413
201511
201624
201717
20181
20192
20200
Total1200