*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197000301215
1970000011
1971000022
1972000011
1973000022
1974000011
1975031048
1976000055
19770270413
1978042028
19792290518
1980004026
198100120618
19820080412
1983112048
1984002057
1985002046
198605120623
1987131111026
198803150624
198907160932
19901111501037
1991415450569
1992331601032
1993613280552
1994425540992
1995823801159
19961318360875
1997112259014106
19986154811181
1999243101451
200019440862
2001593211057
200223580467
20039236008100
2004316670793
20053367909127
2006641121012180
20070292014108
20082115706166
20096234318360
201015832404351
201151454010470
201257368126407
20134120706218
201402630065
201592460158
2016005005
2017106007
Total138321300253253791