*Excludes Observations that spanned multiple years

Pre 197013
19700
19711
1972215
197367
19740
19750
19763
19771
19780
19791
19802
19810
19820
19834
198441
198510
1986122
1987202
1988390
1989435
1990187
1991342
1992122
1993339
1994127
1995123
1996365
1997455
199848
1999117
200074
200180
200241
2003219
2004218
2005234
2006183
2007211
2008212
2009197
2010204
2011212
2012188
2013214
2014207
2015204
2016204
2017176
20180
Total7010