0.1111 if you want it as a decimal
        
                    
             
        
        
        
The answer is 
 0.000568902892652.
        
             
        
        
        
We develop an equation for the given situation by first writing the general equation for lines,
                                 y = mx + b
Substituting to this given the values given above,
 (1990)                      430 = b
 (2000)                      400 = m(10) + 430
The value of m from the equation in 2000 is -3. Thus, the equation of that relates the variables is,
                               y = -3x + 430
 
        
             
        
        
        
1/3
3/9
4/12
are equivalent to 2/6