*Excludes Observations that spanned multiple years

Pre 197010
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19850
19860
19870
19880
19890
19900
19910
19928
19938
19941
19950
1996121
199735
19987
19990
20001
20012
20021
20039
2004389
2005257
2006232
2007111
20086
20092
20102
20113
20120
20132
20143
20150
20160
20170
Total1211