*Excludes Observations that spanned multiple years

Pre 19702
19700
19714
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19840
19851
198645
1987103
1988288
19896
199013
199151
199246
199331
199418
1995113
1996128
1997152
199823
199948
200012
200135
200219
20030
20042
20051
20061
20071
20081
20093
20102
20110
20122
20132
20140
20152
20160
20170
20183
20192
20201
20210
20220
20230
20242
Total1163