*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970212049
1970018009
197106130019
197206420048
197300110112
19740280010
1975002002
1976003014
1977116019
1978001001
1979003014
1980001023
198100110011
198200130215
1983003014
1984001034
1985016018
1986014027
1987003014
1988115018
19890290112
19901370112
1991610110027
19922280113
19933570116
199435280238
199506520260
199609300140
1997115200137
199805450252
199926150023
200048280141
200104320036
200200400141
200302150219
200403260130
200531130219
200602400345
200723250131
2008027009
200900110011
201053440456
201142290540
201220170120
201310310133
201462320040
2015107008
2016024006
2017003003
2018023005
2019133007
2020331007
Total541307890551028