Create variable with repeating values

What I want: A vector with years from 1990 to 2000 with each year appearing 10 times, then 2001 to 2010 5 times per year.

years_1 <- rep(1990:2000, each=10) 
years_2 <- rep(2001:2010, each=5) 
# take them together 
years <- append(years_1, years_2)