This is what Apple shares do after new products

Apple is expected to take the wraps off a new iPhone and perhaps a smartwatch on Tuesday — and if the past is any guide, that'll be good news for investors.

Read MoreThis chart says Apple's in big trouble

In recent years Apple shares have averaged small gains the day of an iPhone introduction, one week later and two weeks later (though it has been less successful with iPad releases).

Product
Event Date
Day of
1-Wk
2-Wks
1-Mos
3-Mos
6-Mos
12-Mos
iPhone 5s/c 9/17/2013 1.16 7.42 7.17 10.8 21.89 15.69 50.96
iPhone 5 9/12/2012 1.39 4.82 -0.69 -5.98 -19.53 -36.04 -29.43
iPhone 4s 10/4/2011 -0.56 7.46 13.35 7.45 10.99 67.6 79.01
iPhone 4 6/7/2010 -1.96 1.33 7.66 3.08 2.74 26.81 32.32
iPhone 3GS 6/8/2009 -0.57 -5.39 -4.5 -4.61 20.22 31.99 73.33
iPhone 3G 6/9/2008 -2.17 -2.63 -4.65 -4.05 -16.48 -44.9 -21.41
iPhone 1/9/2007 8.31 4.89 -7.42 -10.05 1.17 40.79 93.8
Avg. 0.8 2.56 1.56 -0.48 3 14.56 39.8
iPad Air / iPad mini with Retina display 10/22/2013 -0.29 -0.61 1.07 -0.01 6.09 2.28 32.21
iPad (4th gen) / iPad mini 10/23/2012 -3.26 -1.53 -4.97 -6.82 -16.2 -33.79 -14.41
iPad with Retina Display 3/7/2012 0.08 11.1 13.53 19.41 7.73 28.22 -18.86
iPad 2 3/2/2011 0.8 0.1 -6.28 -2.15 -1.71 6.23 54.83
iPad 1/27/2010 0.94 -4.16 -6.14 -1.57 26.05 27.03 65.1
Avg. -0.34 0.98 -0.56 1.77 4.39 5.99 23.77

—Analysis by CNBC's Giovanny Moreano. Follow him on Twitter @giovannymoreano.