Here's how all the 2012 home fixtures stack up attendance-wise thus far:
40,907 Thursday 12th April 2012 vs Reds [home opener; 7th highest attendance at Nats Park all-time]
39,496 Saturday 5th May 2012 vs Phillies
35,489 Saturday 14th April 2012 vs Reds
34,377 Friday 4th May 2012 vs Phillies
33,058 Sunday 6th May 2012 vs Phillies
26,959 Friday 13th April 2012 vs Reds
26,745 Saturday 21st April 2012 vs Marlins
25,679 Sunday 15th April 2012 vs Reds
[25,332 - 2012 SEASON AVERAGE to date]
24,640 Friday 20th April 2012 vs Marlins
23,902 Tuesday 15th May 2012 vs Padres
22,675 Tuesday 1st May 2012 vs Diamondbacks
19,656 Thursday 3rd May 2012 vs Diamondbacks
19,434 Monday 14th May 2012 vs Padres
18,045 Thursday 19th April 2012 vs Astros
17,886 Tuesday 17th April 2012 vs Astros
16,274 Wednesday 2nd May 2012 vs Diamondbacks
16,245 Monday 16th April 2012 vs Astros
14,520 Wednesday 18th April 2012 vs Astros