Capital stock depreciation rate, how to calculate? I am trying to work out the depreciation rate using the following information, it is an extract from a longer data set on capital stock: 



Just wanted to find out what the rate of depreciation is for 2000. I used $K_t=K_{t-1}+I-\delta K_{t-1}$ to calculate the rate of depreciation $\delta$ but I am not satisfied with the result. Any help is appreciated! Note, this is not a homework.
Rate of depreciation  = depreciation/gross stock in the current year. So 1.7%. Strictly speaking there is no way to calculate depreciation because the timing of capital formation is unknown, but capital begins depreciating as soon as it is formed.