Pseudo random 10 negative and positive numbers in array in C

I am trying to draw 10 pseudo random numbers form -10 to 10 and then print them. Unfortunately the amount of numbers isn't 10 - sometimes it's 8, 9, 11 etc. I don't understand why, can you tell me what is wrong in this code?

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define n 10

int main()
{
    int tab[n];
    int i;
    srand(time(0));

    for(i=0;i<n;i++)
    {
        tab[n] =(rand()%20)-10;
        printf("%3d",tab[n]);
    }

    return 0;
}

Thank you in advance.