*Excludes Observations that spanned multiple years

Pre 197057
197010
19710
197231
197381
1974248
1975192
1976152
197774
1978121
197989
1980144
1981124
1982108
1983184
1984382
1985209
1986173
198767
1988100
1989167
1990186
1991109
1992179
1993190
1994155
1995202
1996164
1997119
1998192
1999207
2000186
2001210
2002315
2003230
2004240
2005260
2006327
2007301
2008410
2009372
2010406
2011252
2012251
2013213
201412
20150
20161
20170
Total8402