Question

cual es la diferencia entre el ingreso por aportaciones y el gasto por pago de beneficios para cada año

Answer 1

The differences are 
2000 119
2010 176
2020 154
2030 -436

Due to the small size data set, it would not be appropriate to predict future years unless some proven method applicable to this case is used.

Please note that this size functions strictly in English.  There is no guarantee that your next question in other languages will be answered.  You could try the Spanish section if you have difficulty working in English.