Thank you sir, for your valuable suggestion. I will try to get data from your link. 

You may want also to consider in-situ observations.

The "Permanent Service for Mean Sea Level" is probably the best to start,

http://www.psmsl.org/

You might get data from an Interactive Sea Level time map of University of Colorado.

Jason-1, Jason-2 and TOPEX satellites data are available:

http://sealevel.colorado.edu/content/interactive-sea-level-time-series-wizard

All the possible answers are given above

You can also consult the Permanent Service for Mean Sea Level:

http://www.psmsl.org/data/

To read some methodology, I recommend some authors like Pablo Fraile, Zhang, etc.

https://www.researchgate.net/profile/Pablo_Fraile

http://link.springer.com/article/10.1007/s10584-010-9987-2

Regards.

Thanks Daniel!

Thank you for teach me, mate!

You can get data from University  OF Hawaii sea level data center,the link is given below:hope it will be useful!

http://uhslc.soest.hawaii.edu/data/?rq

also you can get sea surface elevation from Hycom dataset;notice that the dataset contains the years between 1992 to 2012!

You may can get it in marine.copernicus.eu/services-portfolio/access-to-products/

It's free