*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970000202
1970000000
1971000101
1972000000
1973000000
1974000101
1975000000
1976000000
1977000202
1978000303
1979000505
1980000202
1981000303
1982000202
1983000101
1984000202
1985001304
1986000505
1987000606
1988000505
1989000808
1990001539
19910025411
19920008412
19930009211
1994001101021
199500419427
19960028111
19970016411
19980016512
1999000617
200000122124
200100115117
200200031031
2003001291141
200400024226
20050015511
200600045146
200700026430
200800024024
200900232640
201000132942
201100033639
201200172028
201300125531
20140007512
201500112821
2016000202
2017000000
2018000000
Total0023504122649