Year-over-Year Trending Graph

[#1]

Does anyone know how to graph a comparative y/y? I want the graph to look like this:

The QV data is in a two-dimension table like this:

Month	Sales Volume
1/31/2007	663.25
2/28/2007	672.15
3/31/2007	765.51
4/30/2007	776.44
5/31/2007	830.62
6/30/2007	748.55
7/31/2007	835.88
8/31/2007	843.76
9/30/2007	878.79
10/31/2007	847.39
11/30/2007	851.20
12/31/2007	786.00
1/31/2008	696.64
2/29/2008	764.72
3/31/2008	878.70
4/30/2008	875.89
5/31/2008	807.88
6/30/2008	773.22
7/31/2008	917.78
8/31/2008	1,109.32
9/30/2008	823.75
10/31/2008	839.87
11/30/2008	734.93
12/31/2008	864.93
1/31/2009	838.23
2/28/2009	646.93
3/31/2009	804.08
4/30/2009	750.71
5/31/2009	776.80
6/30/2009	723.55
7/31/2009	909.66
8/31/2009	859.06
9/30/2009	884.46
10/31/2009	810.95
11/30/2009	774.06
12/31/2009	1,028.34
1/31/2010	782.46
2/28/2010	850.34
3/31/2010	1,074.08
4/30/2010	891.20

I realize I could create a cross-table looking like this:

Year	Jan	Feb	Mar	Apr	May	Jun	Jly	Aug	Sep	Oct
2007	663.25	672.15	765.51	776.44	830.62	748.55	835.88	843.76	878.79	847.39
2008	696.64	764.72	878.7	875.89	807.88	773.22	917.78	1,109.32	823.75	839.87
2009	838.23	646.93	804.08	750.71	776.8	723.55	909.66	859.06	884.46	810.95
2010	782.46	850.34	1,074.08	891.2

But given the volume of detail I'm dealing with (Jan '08 to present resulting in 200,000ish records), it's just impractical.

Any suggestions?

[johnw · Accepted solution]

Line chart with two dimensions, month(Month) and year(Month). Make them real fields instead of calculated dimensions for improved performance. See attached.

[#3]

I have been working on this for 2 days.  I knew the answer had to be very simple but I just could not get it.  THANK YOU so much!!!