*Excludes Observations that spanned multiple years

Pre 19700
19700
19712
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19832
198414
1985131
1986102
1987105
1988524
198935
199064
1991184
199267
1993286
1994193
1995157
1996100
199761
19989
199992
200050
200123
200219
200375
200458
200558
200651
200751
200845
200966
201051
201165
2012110
201366
201464
201558
201650
201743
201818
201919
20203
20219
202215
20236
20240
Total3201