*Excludes Observations that spanned multiple years

Pre 197011
19703
19711
19721
19730
19743
19752
19761
19772
19781
19791
19801
19810
19822
19830
19840
19850
19861
19870
19881
19890
19900
19912
19925
19930
19940
19950
19960
19970
19980
19990
20000
20011
20021
20031
20041
20050
20060
20070
20080
20092
20102
20112
20120
20130
20140
20150
20160
20170
20180
Total48