*Excludes Observations that spanned multiple years

Pre 1970210
19701
19712
19722
19737
19742
19752
19761
197761
19781
19791
19800
19810
19820
19833
19840
1985366
1986838
19871
19881
19897
1990148
19915
19923
19938
199478
199567
1996749
1997107
1998147
1999815
2000283
2001847
2002561
20032234
20041270
2005769
2006330
2007617
2008187
2009756
20102339
2011758
20121067
20132051
2014864
20152437
20161021
2017203
201855
Total22282