*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197224
19731
19740
19750
19760
19770
19780
19790
19801
19810
19820
19830
19840
19855
198643
198730
198887
198927
199094
1991184
1992101
199357
199428
199537
199612
19975
19981
19995
200011
20016
20028
20035
20045
200518
20067
20073
20086
20093
201055
201129
201216
201314
20147
201512
201614
201711
2018162
20190
Total1134