*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19853
19865
19873
19886
19893
19903
19912
19920
19930
19940
19958
199625
199758
199882
1999118
200092
2001183
2002245
2003318
2004360
2005269
2006270
2007480
2008334
2009621
2010630
2011273
2012357
2013410
20140
20150
20160
20170
Total5158