*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970200204
1970000000
1971200002
1972000000
1973000000
1974000044
1975000101
1976000011
1977100517
1978100326
1979000516
1980300306
1981100304
1982000606
1983100416
1984100102
1985000123
19860018413
19871015310
19883016212
198930113421
199010011719
199100217726
199240021429
199300517729
1994204201642
199510121124
199600320831
199770225539
1998501241040
199940024432
200040222533
200160219532
200220132136
200320245352
200420031538
200520047857
200610160466
200710052255
200810065167
20090031581162
20101021760179
20111012303235
20124012305240
20130001010101
201400010010
201500014014
2016000101
2017000314
2018000000
Total7003715621381807