*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19842
19850
19860
19870
19880
19890
19900
19910
19921
19930
19940
19950
19960
19970
19980
19992
20002
20010
20020
20030
20044
20050
20060
20070
20080
20090
20100
20110
20121
20130
20140
20150
20160
20170
Total13