*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197015001016
1970100102
1971000000
1972200103
1973100102
1974200103
1975000000
1976200204
1977400509
1978400004
1979200204
1980500308
19813016010
1982600309
1983200204
1984600309
1985400217
1986300418
19876005011
198870010118
198950015020
19904029621
199110318830
199220116221
199360130239
199450342454
199550138448
199660226135
199770118127
199870138147
1999100218030
200070331041
200170124335
200280140150
200350120430
200450126133
2005130228548
2006110031345
2007132146365
2008131044159
200930044148
201000062163
20116031083120
2012120112126
201300230133
2014100182140
201500011213
2016000202
2017000000
2018000000
Total237334897831254