*Excludes Observations that spanned multiple years

Pre 19708
19700
19711
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19820
19830
19842
19850
19860
19870
19880
19897
19900
19916
19921
19930
19940
19952
199612
19971
19980
19990
20001
20010
20020
200311
200429
2005151
20063
20072
200860
200946
201026
2011137
2012124
201374
201413
201524
201622
201737
201880
201954
202011
20210
Total945