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*Excludes Observations that spanned multiple years

Pre 19701
19700
19715
19722
19730
19740
19750
19760
19770
19781
19790
19800
19810
19820
19830
19841
198520
198639
198748
1988127
198917
19907
199170
199227
199340
199450
199536
199660
199759
199810
199924
200014
200133
200214
20034
200414
200511
20069
200714
20089
200914
20107
20118
20128
201314
201410
201512
201614
20175
20180
20190
20200
20210
Total858