*Excludes Observations that spanned multiple years

Pre 19701
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19883
19891
19900
19912
19929
19931
19940
199535
19960
19970
199813
19990
20000
20010
20020
20031
20042
20050
20060
20073
20080
20090
20100
20110
20120
20131
20144
20150
20160
20172
20180
20193
20200
20210
20220
Total82