*Excludes Observations that spanned multiple years

Pre 19702
19700
19715
19720
19730
19742
19750
19760
19775
19783
19793
19802
19810
19820
19831
19841
198591
198672
1987133
1988275
1989102
199042
1991210
1992262
1993476
1994470
1995485
1996289
1997219
199873
1999190
2000116
2001200
200295
200395
2004122
2005167
200696
2007121
2008104
200990
201088
2011101
2012123
2013115
2014122
2015130
2016130
2017111
201839
201923
20202
20210
Total5603