*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19751
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19925
19931
19940
19950
19960
19970
19980
19990
20000
20011
20021
20031
20045
20052
20060
20073
20082
20091
20106
20112
201210
20130
20140
20150
20160
20170
Total41