Determine the base ratio, and take the index value of the earliest year of 20 10 as the base period number. Make a ring comparison, and the index value of the previous year is the base period. For example:

Suppose an index value is 280 in 20 10; 20 1 1 year is 310; 360 in 20 12. Seek: fixed proportion and chain-on-chain growth and growth rate.

1, find the fixed base growth

From 20 1 1 to 20 10 =3 10-280=30.

From 20 12 to 20 10 =360-280=80.

2. Seek the growth of the chain.

From 20 1 1 to 20 10 =3 10-280=30.

20 12 increased to 2011= 360-310 = 50.

3. Determine the fixed base growth rate

The growth rate is 20 1 1 to 2010 = (310-280) ÷ 280×100% =10.75438+0%.

The growth rate from 20 12 to 20 10 = (360-280) ÷ 280×100% = 28.57%.

4. Find the chain growth rate.

The growth rate is 20 1 1 to 2010 = (310-280) ÷ 280×100% =10.75438+0%.

Growth rate from 20 12 to 20 1 1 year = (360-310) ÷ 310×100% =16.