*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19781
197910
19801
19811
198222
198344
198412
198543
198665
198764
198845
198937
199068
199150
199237
199343
199450
199525
199651
199766
199892
199980
2000124
2001166
2002103
2003228
2004114
2005146
2006163
2007129
2008101
2009363
2010328
2011159
2012261
2013249
201429
20150
20160
20170
Total3572