*Excludes Observations that spanned multiple years

  B
b
t
W
w
 
Pre 197059002162
1970100102
1971400004
1972400004
1973700007
1974500005
1975700108
19769002011
1977900009
1978600006
197910002012
198010000010
198113000013
19828002010
1983700108
198410002113
198511000011
198611004116
198710003013
198812002115
198912000113
199014001116
199170012423
19929016319
1993170041738
1994170053961
1995821127396
1996100146378
1997130133047
199812004100116
199917003525
2000170012110139
20011901115182
2002150017128160
20031800797122
2004180012128158
20052010122154
20062110134782
2007150321182221
20081210133157
200960017730
2010400342159
2011800401563
20121400133966
2013100123750
201400063137
2015000707
2016000606
2017000000
2018100001
Total5385832912852165