*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19850
19860
19870
19881
19890
19900
19910
19920
19931
19941
19951
19960
19971
19980
19992
20000
20011
20021
2003664
2004211
2005247
20068
200718
200826
2009156
20108
20113
20124
20133
20145
20157
201633
201760
20180
Total1462