*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19782
19795
19800
19812
19822
19837
19847
198512
19862
198713
198818
198918
19901
199126
199215
199310
199446
199570
199649
199754
199899
1999160
200056
2001174
2002177
2003235
2004330
2005245
2006222
20071074
2008525
2009776
2010816
2011632
2012611
2013553
20144
20150
20160
20170
Total7048