*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19731
19741
19750
19763
19776
19780
19791
19800
19818
19820
19830
19841
19851
19860
19870
19880
19890
19900
19910
199214
199315
19944
19951
19960
199741
19980
19991
20002
200137
20020
200338
20040
20051
20061
20070
20086
20096
20100
20117
20122
20135
20144
20151
201616
201713
20185
201965
202011
20217
20228
20239
20241
Total343