The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions? The difference between 15 years and 20 years of social security payment, the difference in the number of years of payment, and the difference in pensions?