Mother[']s Day:To Optimize With or Without the Apostrophe

I was just looking over last year's search stats (2008) for a floral website that I run that ranked in the top 5 results (in Google) for all of the following keywords. Of interest in that regard, is the search volume difference between the use or non use of the apostrophe.

These stats represent the 5 days leading up to Mother's Day. 

Keyword	Visits	% visits
mothers day flowers	2,366	44.69%
mother's day flowers	1,585	29.94%
flowers for mothers day	427	8.07%
flowers for mother's day	158	2.98%
flowers mothers day	84	1.59%

thanksgivingflowers.net search stats for Friday below.

Looks like the last few days have been close in stats.

Visits 100 % of Site Total: 97.09%

Pages/Visit 1.24 Site Avg: 1.27 (-2.50%)

Avg. Time on Site 00:00:14 Site Avg: 00:00:15 (-8.06%)

% New Visits 94.00% Site Avg: 93.20% (0.85%)

Bounce Rate 82.00% Site Avg: 80.58% (1.76%)

Dimension: Keyword		Visits	Pages/Visit	Avg. Time on Site	% New Visits	Bounce Rate
1.	thanksgiving flowers	43	1.40	00:00:18	88.37%	72.09%
2.	thanksgiving centerpieces	18	1.06	00:00:21	100.00%	88.89%
3.	thanksgiving flower arrangements	15	1.33	00:00:09	100.00%	80.00%
4.	thanksgiving floral centerpieces	3	1.33	00:00:29	100.00%	66.67%
5.	flowers for thanksgiving	2	1.00	00:00:00	100.00%	100.00%
6.	thanksgiving flower	2	1.00	00:00:00	100.00%	100.00%
7.	thanksgiving flower arrangement	2	1.00	00:00:00	100.00%	100.00%
8.	51136be6dd2643132cd82f0eec5ff90f7c407282b96d3a29c203b263c0570005	1	1.00	00:00:00	100.00%	100.00%
9.	51136be6dd2643139a553a8cbb835337f3b43f4bf2d00ceb18bc1dd006dd0d1f	1	1.00	00:00:00	100.00%	100.00%
10.	8ea22bf75f4400672e0b7d24bc1bb7a2668408d11755cbe50e95dfcfbb32f737	1	1.00	00:00:00	100.00%	100.00%
11.	centerpieces for thanksgiving	1	1.00	00:00:00	100.00%	100.00%
12.	floral thanksgiving centerpieces	1	1.00	00:00:00	100.00%	100.00%
13.	flower arranging for thanksgiving	1	1.00	00:00:00	100.00%	100.00%
14.	flowers of thanksgiving	1	1.00	00:00:00	0.00%	100.00%
15.	flowers thanksgiving	1	1.00	00:00:00	100.00%	100.00%
16.	free thanksgiving flowers	1	1.00	00:00:00	100.00%	100.00%
17.	thanksgiving floers	1	1.00	00:00:00	100.00%	100.00%
18.	thanksgiving floral arrangements	1	1.00	00:00:00	100.00%	100.00%
19.	thanksgiving flower arrangments	1	1.00	00:00:00	100.00%	100.00%
20.	thanksgiving flower centerpieces	1	1.00	00:00:00	100.00%	100.00%
21.	thanksgiving flowers online	1	1.00	00:00:00	100.00%	100.00%
22.	thanksiving flowers	1	1.00	00:00:00	100.00%	100.00%