*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970400105
1970100001
1971000000
1972000000
1973200002
1974000000
1975200002
1976200002
1977200507
1978000101
1979100203
1980000505
19812008010
1982300104
1983200305
1984100102
1985100304
1986200608
19873045113
19885016416
19893017112
19902025413
199120512625
199240016424
199320317123
1994901181038
199530416427
199620320328
199770019228
199850416732
1999120015330
2000120324241
200180613330
200230028233
200380424440
200450019327
2005602211140
200680033849
200780036044
200840038244
200910357061
201010065268
20111001120113
201230339045
201320028030
201400015015
201500010111
2016000000
2017000213
2018000000
Total154049772891064