*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100045
1970000000
1971000000
1972000000
1973111014
1974001012
1975000000
1976001023
1977000022
1978301015
1979002002
1980001012
1981202004
198215360125
198324250031
198424640034
198529850143
1986249180152
19872710140152
19883411210571
19893612310483
199052550264
1991142820098
19921268603107
199323913504171
199433214308186
199528512700160
1996391210200153
1997321312202169
199841117402128
1999414911607213
200039477100157
200157519203203
2002355014001226
200335385100124
200448668101196
200559989502254
2006317810903221
2007112370151
200825580166
200900710273
201000960096
2011029602100
201201330034
201310350036
201401190020
2015100140024
20162270011
2017001001
Total81861422610693762