*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19780
19790
19800
19810
19821
19831
19840
19851
19860
19870
19886
19894
19905
199110
19925
19937
19944
199511
199620
19973
19986
19993
20000
20012
20020
20032
20044
20051
20060
20070
20082
20091
20109
20118
20128
201324
20146
20159
201612
20176
20189
20190
20200
20210
20220
Total191