*Excludes Observations that spanned multiple years

Pre 19701
19705
197110
197215
19730
197410
19750
19760
19770
19780
19790
19800
198130
19824
198315
19844
198513
19862
198710
198826
198910
199010
199118
199238
199342
199437
199544
199652
199753
199846
199959
2000121
200145
2002114
200360
200475
200549
2006139
2007127
2008114
2009121
2010110
2011103
2012105
2013103
20142
20150
20160
20170
Total1942