Table:
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011

%

both sources - earnings
72.7
72.2
71.9
71.6
71.0
71.3
71.0
70.9
70.5
69.7
69.7
70.1

single source - earnings
3.1
3.2
3.1
3.3
3.5
3.2
3.6
3.6
3.5
2.9
2.3
1.3

single source - no earnings
24.2
24.6
25.0
25.2
25.4
25.5
25.4
25.5
26.0
27.4
28.1
28.6

single source - no earnings
0.0
0.0
0.0
0.0
0.0
0.1
0.0
0.0
0.0
0.0
0.0
0.0

Statement: approximately 71% on average of cases in each year show earnings in both the t1ff and t4.
Question: what is the percentage on average of cases in each year show earnings in both the t1ff and t4?
Answer: [71.05]