*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 1970002002
1970000000
1971001001
1972000000
1973000000
1974001001
1975001001
1976000000
1977005005
1978001001
1979001001
1980000000
1981002002
1982001001
1983002002
1984000000
1985002002
1986002002
1987007007
1988005005
1989005005
1990006006
199100150015
199200130013
199300100010
199400120012
199500230023
199600130013
199700150015
199800180018
199900100010
200000190019
200100180018
200200310031
200300170017
200400120012
200500140014
200600190019
200700240024
200800150015
200900260026
201000210021
201100220022
201200410041
201300260026
201400400040
201500640064
201600720072
20170010100101
20180010600106
20190010000100
20200011300113
20210013600136
202200760076
2023006006
202400130013
Total001305001305