*Excludes Observations that spanned multiple years

Pre 19706
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19895
19900
19910
19924
19931
19940
199510
19960
19970
19980
19990
20001
20010
20020
20030
20043
20050
20060
20070
20080
20090
20100
20111
20120
20132
20140
20150
20160
20170
Total33