I'm havinf a problem with a simple file

i have the following data

State  1960  1970  1980  1990
1         All India 35988.70 37346.00 39707.30 42321.00
2    Andhra Pradesh  3431.03  3163.27  3687.23  3695.63
3             Assam  1902.93  2001.60  2278.47  2525.33
4             Bihar  5277.07  5133.80  5138.70  4662.57
5           Gujarat   538.13   456.10   484.23   590.47
6           Haryana   169.33   283.67   489.00   698.67
7  Himachal Pradesh    99.38    99.30    97.07    82.50
8   Jammu & Kashmir   226.97   221.83   267.83   275.50
9         Karnataka  1084.37  1096.80  1126.43  1319.73
10           Kerala   802.97   874.57   795.67   528.97
11   Madhya Pradesh  4258.87  4495.97  4857.37  5170.73
12      Maharashtra  1352.57  1324.07  1501.77  1555.10
13           Orissa  4359.63  4544.33  4136.10  4515.53
14           Punjab   262.93   438.47  1255.67  2106.00
15        Rajasthan   111.83   129.57   142.80   140.87
16       Tamil Nadu  2640.90  2742.60  2195.40  2202.87
17    Uttar Pradesh  4358.80  4553.03  5248.03  5419.23
18      West Bengal  4549.07  5005.47  5082.57  5763.07


i have to find out the percentage in area under rice cultivation from 1960
and 1990  for all india and for each of the states
but for some reason when i am using the command
(1990-1960)/1990*100-> ricefile1$areachange

the areachange column is showing the following (it is showing the area
change only for all india and replicating itt for all the states as well

 State     1960     1970     1980     1990 areachange
1         All India 35988.70 37346.00 39707.30 42321.00   1.507538
2    Andhra Pradesh  3431.03  3163.27  3687.23  3695.63   1.507538
3             Assam  1902.93  2001.60  2278.47  2525.33   1.507538
4             Bihar  5277.07  5133.80  5138.70  4662.57   1.507538
5           Gujarat   538.13   456.10   484.23   590.47   1.507538
6           Haryana   169.33   283.67   489.00   698.67   1.507538
7  Himachal Pradesh    99.38    99.30    97.07    82.50   1.507538
8   Jammu & Kashmir   226.97   221.83   267.83   275.50   1.507538
9         Karnataka  1084.37  1096.80  1126.43  1319.73   1.507538
10           Kerala   802.97   874.57   795.67   528.97   1.507538
11   Madhya Pradesh  4258.87  4495.97  4857.37  5170.73   1.507538
12      Maharashtra  1352.57  1324.07  1501.77  1555.10   1.507538
13           Orissa  4359.63  4544.33  4136.10  4515.53   1.507538
14           Punjab   262.93   438.47  1255.67  2106.00   1.507538
15        Rajasthan   111.83   129.57   142.80   140.87   1.507538
16       Tamil Nadu  2640.90  2742.60  2195.40  2202.87   1.507538
17    Uttar Pradesh  4358.80  4553.03  5248.03  5419.23   1.507538
18      West Bengal  4549.07  5005.47  5082.57  5763.07   1.507538

please help!
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