*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
198616
19871
19881
19895
19900
19912
19921
199317
19943
199522
199612
19977
19981
19993
20000
20010
20020
20030
20040
20052
20060
20070
20087
20090
201028
201159
20120
20130
20141
20150
20160
20170
Total190