*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19731
19740
19750
19760
19770
19780
19790
19800
19810
19822
19830
19840
19853
19860
19870
19880
19890
19900
19910
19920
19930
19940
19950
19960
19971
19986
19990
20002
20010
20020
20030
20040
20051
20060
20070
20080
20090
20100
20110
20120
20130
20141
201562
201614
20170
20180
Total96