For-Loop on a Multivariate regression model in Rstudio

Hi guys,

I am trying to do a loop for a regression model on energy data. There are columns for state, MSN(Type of energy) and the years from 1960-1990 in 5 year steps and 1991 to 2017 yearly. I tested my model for 1960 and it worked perfectly. However I have a problem doing the "for"-Loop to do the regressions on the columns/years 1961-2017. Heres some view on the Dataset itself:
Data

Thats the problematic passage of the code with the model for 1960 working fine!

Model_1960 <- lm(log(X1960[which(MSN=="KILOM")]+1) ~ log(X1960[which(MSN=="PAACB")]+1) + log(X1960[which(MSN=="NGACB")] + X1960[which(MSN=="PQACB")] +1) + log(X1960[which(MSN=="EMACB")] + X1960[which(MSN=="ESACB")] +1) , data=Data_Total)
summary(Model_1960)

df_list = colnames(Data_Total[3:36])

for(i in df_list){
  df_i = mutate(get(i), FUN)
  Model_i <- lm(log(i[which(MSN=="KILOM")]+1) ~ log(i[which(MSN=="PAACB")]+1) + log(i[which(MSN=="NGACB")] + i[which(MSN=="PQACB")] +1) + log(i[which(MSN=="EMACB")] + i[which(MSN=="ESACB")] +1) , data=Data_Total)
  summary(Model_i) 
}

sapply(colnames(Data_Total[3:36]), function(x) {
  Model <- lm(log("x"[which(MSN=="KILOM")]+1) ~ log("x"[which(MSN=="PAACB")]+1) + log("x"[which(MSN=="NGACB")] + "x"[which(MSN=="PQACB")] +1) + log("x"[which(MSN=="EMACB")] + "x"[which(MSN=="ESACB")] +1) , data=Data_Total)
  summary(Model)} )

Error codes are:

> df_list = colnames(Data_Total[3:36])
> 
> for(i in df_list){
+   df_i = mutate(get(i), FUN)
+   Model_i <- lm(log(i[which(MSN=="KILOM")]+1) ~ log(i[which(MSN=="PAACB")]+1) + log(i[which(MSN=="NGACB")] + i[which(MSN=="PQACB")] +1) + log(i[which(MSN=="EMACB")] + i[which(MSN=="ESACB")] +1) , data=Data_Total)
+   summary(Model_i) 
+ }
Error in get(i) : object 'X1960' not found
> 
> sapply(colnames(Data_Total[3:36]), function(x) {
+   Model <- lm(log("x"[which(MSN=="KILOM")]+1) ~ log("x"[which(MSN=="PAACB")]+1) + log("x"[which(MSN=="NGACB")] + "x"[which(MSN=="PQACB")] +1) + log("x"[which(MSN=="EMACB")] + "x"[which(MSN=="ESACB")] +1) , data=Data_Total)
+   summary(Model)} )
Error in "x"[which(MSN == "KILOM")] + 1 : 
  non-numeric argument to binary operator
Called from: eval(predvars, data, env)

I hope anybody could help me!