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*Excludes Observations that spanned multiple years

Pre 19700
19700
19712
197220
19730
19740
19750
19760
19770
19780
19790
19800
19811
19820
19834
198466
1985175
1986166
1987196
1988612
198993
1990127
1991236
1992100
1993300
1994193
1995157
1996100
199761
19989
199992
200050
200123
200219
200358
200437
200549
200643
200739
200833
200945
201042
201152
201298
201358
201443
201550
201642
201730
20182
20190
20200
20210
Total3523