*Excludes Observations that spanned multiple years

Pre 19701
19701
19710
19720
19730
19740
19750
19763
19774
19781
19791
19801
19812
19820
19830
19841
19850
19863
19870
19881
19892
19901
19911
19921
19931
19940
19951
19961
19972
19980
19994
200010
20015
20024
20033
20041
20050
20062
20071
20083
20090
201015
201126
20124
20138
201411
201518
201623
201751
201849
201933
20200
20210
20220
Total300