When is Shavuot in 2012, 2013, 2014 and 2015?

The holiday of Shavuot falls on the Hebrew calendar dates of Sivan 6–7. Here are the coinciding secular dates for the upcoming years:

2012:   May 26–28

2013:   May 14–16

2014:   June 3–5

2015:   May 23–25

Note: The Jewish calendar date begins at sundown of the night beforehand. Thus all holiday observances begin at sundown on the secular dates listed, with the following day being the first full day of the holiday. Jewish calendar dates conclude at nightfall.

See also:

When is Rosh Hashanah in 2012, 2013, 2014 and 2015?
When is Yom Kippur in 2012, 2013, 2014 and 2015?
When is Sukkot in 2012, 2013, 2014 and 2015?
When is Shemini Atzeret / Simchat Torah in 2012, 2013, 2014 and 2015?
When is Chanukah in 2012, 2013, 2014 and 2015?
When is Purim in 2012, 2013, 2014 and 2015?
When is Passover in 2012, 2013, 2014 and 2015?
When is the Ninth of Av in 2012, 2013, 2014 and 2015?