*Excludes Observations that spanned multiple years

Pre 19703
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19831
19840
19850
19860
19870
198823
19890
19903
199155
1992111
199311
19944
19950
19961
19970
19981
19990
20006
20010
20021
20033
20043
20050
20060
20071
20081
20094
20102
20112
20121
20130
20142
20151
20163
20171
20181
20193
20202
20216
20225
20234
20241
Total266