*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000000
1970000101
1971000000
1972000000
1973000101
1974000000
1975000000
1976000202
1977000101
1978000101
1979000000
1980000101
1981000000
1982000202
1983000101
1984000101
1985000314
1986000101
1987000516
1988000718
1989000639
1990002529
199100410317
199200717226
199300127533
1994000491766
199500353561
199600269677
1997000151328
1998000321244
199900013417
200000057461
200100124328
200200237645
200300031738
200400013619155
2005000351247
2006006441060
2007000382361
200800030838
200900030232
20100018925115
201100040949
201200011617
201300020121
201400113014
20150009312
2016000415
2017001214
2018000000
Total00319632251219