Table:
year and industry
total business r&d
software r&d

2006

all industries
247669
48299

manufacturing
171814
10720

nonmanufacturing
75855
37579

2016

all industries
374685
120824

manufacturing
250553
35984

nonmanufacturing
124132
84840

2006-16 annual growth rate (%)a

all industries
4.2
9.6

manufacturing
3.8
12.9

nonmanufacturing
5
8.5

Statement: over the past 10 years, total business r&d increased annually at a 4.2% compound average growth rate.
Question: over the past 10 years, how many percentage points did total business r&d increase annually at compound average growth rate?
Answer: [4.2]