*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19772
19780
19790
19800
19810
19820
19830
19840
19850
19860
19878
19880
19890
19906
19913
19927
19934
19942
199527
199632
199732
19985
19991
20007
20010
20025
20032
20040
20054
20060
20071
20080
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total148