*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19753
19763
19770
197816
19796
19800
19810
19825
19831
198413
19850
19861
19875
19880
19890
19903
19913
19929
19937
199418
199518
199670
199740
199873
1999429
2000172
200182
200275
200384
2004122
2005140
2006202
2007176
2008144
2009173
2010199
2011163
201275
2013137
201454
20150
20160
20171
Total2722