*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19891
19900
19914
199211
19932
19940
19952
19962
19972
19981
19992
20000
20010
20022
20032
20040
20051
20061
20072
20081
20090
20100
20110
20120
20130
20140
20150
20160
20170
Total39