*Excludes Observations that spanned multiple years

Pre 19704
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19890
19900
19910
19920
19930
19940
19952
199618
199712
19981
19990
20001
20010
20020
20030
20040
20050
20061
20072
20080
20095
20101
20110
20122
20130
20140
20150
20160
20170
Total49