*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19750
19760
19770
19782
19791
19800
19810
19820
19830
19841
19851
19862
19870
19880
19890
19900
19911
199216
19937
19946
19955
19961
199739
19981
19991
20000
200181
200219
200343
200410
20054
200634
20071
20081
200911
201013
201131
201216
201333
201415
201517
201634
201725
20186
201921
20200
20210
20220
Total499