*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19771
19781
19791
19800
19810
19820
19831
19840
19851
19860
19870
19880
19891
19900
19914
19923
199314
19942
199512
199626
199734
19984
19994
20002
20011
20025
20030
20040
20053
20062
20070
20080
20090
20100
20110
20121
20130
20140
20150
20164
20170
Total127