*Excludes Observations that spanned multiple years

Pre 197023
19700
19712
197240
197316
19741
19751
19761
19770
19782
19790
19802
19811
19821
19835
19843
19851
198677
198730
1988479
1989381
199018
199171
199261
1993105
199459
1995154
1996122
1997133
199845
199939
200040
200139
200226
2003116
2004189
2005202
2006124
2007153
2008146
2009193
2010207
2011144
2012120
2013117
2014141
2015125
2016147
2017123
201823
20190
Total4248