*Excludes Observations that spanned multiple years

Pre 197014
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19812
19823
19830
19840
19850
19861
19870
19880
19890
19903
19912
19920
19932
19943
19951
19960
19970
19980
19990
20000
20010
20020
20030
20043
20050
20060
20071
20084
20090
20100
20111
20121
20130
20140
20151
20162
20170
Total45