*Excludes Observations that spanned multiple years

Pre 197016
19700
19710
19720
19730
19740
19750
19761
19779
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
199123
199219
19930
19940
19950
19960
19970
19980
19990
20000
20010
20021
20030
20040
20050
20062
20072
20080
20092
20109
20110
20120
20130
20140
20150
20160
20170
Total84