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This is what Apple shares do after new products

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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/c9/17/20131.167.427.1710.821.8915.6950.96
iPhone 59/12/20121.394.82-0.69-5.98-19.53-36.04-29.43
iPhone 4s10/4/2011-0.567.4613.357.4510.9967.679.01
iPhone 46/7/2010-1.961.337.663.082.7426.8132.32
iPhone 3GS6/8/2009-0.57-5.39-4.5-4.6120.2231.9973.33
iPhone 3G6/9/2008-2.17-2.63-4.65-4.05-16.48-44.9-21.41
iPhone1/9/20078.314.89-7.42-10.051.1740.7993.8
Avg.0.82.561.56-0.48314.5639.8
iPad Air / iPad mini with Retina display10/22/2013-0.29-0.611.07-0.016.092.2832.21
iPad (4th gen) / iPad mini10/23/2012-3.26-1.53-4.97-6.82-16.2-33.79-14.41
iPad with Retina Display3/7/20120.0811.113.5319.417.7328.22-18.86
iPad 23/2/20110.80.1-6.28-2.15-1.716.2354.83
iPad1/27/20100.94-4.16-6.14-1.5726.0527.0365.1
Avg.-0.340.98-0.561.774.395.9923.77

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