*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19862
19872
19880
19890
19900
199113
19921
19930
19940
199511
19960
19970
19980
19990
20002
20011
20020
20031
20042
20050
20060
20070
20081
20092
20100
20110
20120
20130
20140
20150
20160
20171
20181
20192
20204
20211
20224
20233
20241
Total55