*Excludes Observations that spanned multiple years

Pre 1970152
197022
19717
197224
197380
1974213
1975194
1976133
197739
197886
197957
198055
198162
198233
1983168
1984295
1985133
1986183
1987190
1988158
1989172
1990179
1991141
1992212
1993185
1994232
1995266
1996284
1997450
1998363
1999425
2000479
2001356
2002459
2003494
2004449
2005529
2006581
2007543
2008609
2009571
2010556
2011357
2012380
2013312
201484
20150
20160
20170
Total11952