*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
197318
19740
19756
19767
19770
19787
197911
19804
198113
198214
198320
19843
19855
198620
198712
198812
19893
199025
199116
19926
19938
199473
1995133
199686
1997159
1998129
1999526
2000178
2001257
2002236
2003403
2004375
2005361
2006456
20071125
2008485
2009935
20101145
2011634
2012756
2013572
201442
20150
20162
20170
Total9278