*Excludes Observations that spanned multiple years

Pre 19707
19700
19710
197210
19730
19740
19751
19761
19770
19780
19791
19803
19810
19821
198311
19846
19859
198664
198729
198821
198939
19908
199160
199287
1993118
1994107
1995176
199667
199778
199856
199974
200027
200155
200268
200390
2004152
2005205
2006112
2007128
2008111
200993
2010132
2011136
2012123
2013118
2014128
2015115
2016148
2017106
20181
Total3082