*Excludes Observations that spanned multiple years

Pre 19701
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19880
19892
19902
19911
19921
19932
19940
19955
19960
19970
19980
19990
20001
20010
200210
20033
20043
20050
20060
20072
200810
20090
20106
201125
20120
20132
20141
20150
20162
20170
Total79