*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970401005
1970000000
1971000000
1972000000
1973101114
1974100102
1975000000
1976200103
1977200002
1978103105
1979000202
1980100102
1981002204
198210156325
198300245231
198400244634
198510295843
1986102418952
19871027141052
19885034211171
19894036311283
199020555264
1991001482298
19923012866107
199340231359171
199480331432186
199500281275160
1996003910212153
1997203212213169
199820417411128
1999704111649213
200000397147157
200130579251203
2002103514050226
200300355138124
200410488166196
200520599598254
2006303110978221
2007101137251
200810258566
200920071073
201000096096
2011200962100
201200033134
201300135036
201400019120
2015001014024
20160027211
2017000101
2018000000
Total69081822616143762