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*Excludes Observations that spanned multiple years

Pre 19703
19701
19711
1972100
197344
19740
19752
19760
19779
19781
19791
19802
19810
19820
19832
198448
198545
198673
1987177
1988468
198970
1990184
1991512
1992501
1993309
199435
1995210
199652
199743
199838
1999147
2000130
2001142
200265
200316
200489
20053
200615
200758
200832
200929
201020
201128
20127
201321
201417
201510
201624
201714
201830
201941
20201
20210
Total3870