Survival rate?

what is my survial rate/ life expectancy if i was born with Tetralogy of the Fallot and have had 2 surgeries to repair it when i was younger? i have to go in for a third soon because i have also in the last few years developed pulmonary stenosis which came from the TOF. im just wondering because i would really like to know. the past 6 months have been getting worse and worse and ive also been having Congestive Heart Failure signs. I'm 20 right now.