*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19861
19872
19881
19893
19905
19914
19920
199310
19943
199520
199620
199718
19982
19991
20003
20017
20022
20030
20040
20050
20060
20072
20080
20091
20102
20110
20120
20130
20141
20156
20162
20171
20182
20190
20200
20210
20220
Total121