*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970100203
1970000202
1971000000
1972000000
1973000000
1974000000
1975000303
1976000000
1977000202
1978000101
1979000202
1980000112
1981000112
1982000202
1983000101
1984000101
1985000101
1986000101
1987000729
1988000246
1989000167
199000031518
1991000112
1992001258
199300151925
1994001173755
199500151016
199600491730
199700694459
1998003125166
199900476071
2000002187090
20011011493109
2002002274574
200300123130154
200400324211238
2005002177695
20060024588135
200700144108153
200800234172208
20090046552121
201000479125208
20110017234107
2012000163248
20130016386150
2014001303768
201500123327
2016001304
2017001012
2018000000
Total205169716362386