*Excludes Observations that spanned multiple years

Pre 19702
19701
19717
19723
19730
19740
19750
19760
19773
197812
19794
19805
19811
19824
19835
19847
198576
198691
1987187
1988553
1989100
199047
1991240
1992213
1993698
1994874
1995475
1996334
1997240
199875
199976
200061
2001142
200266
2003116
2004171
2005179
2006126
2007154
2008117
2009137
2010176
2011136
2012171
2013160
2014146
2015163
2016135
2017130
201846
201914
20207
202125
202223
202316
20242
Total6952