Table:
text: Dancing with the Stars (U.S. season 10)
Ratings
Ratings
Episode_Number Episode Original_Airdate Rating Share_ Rating_Share_18_49 Viewers_millions Weekly_Rank
10.08 Week 5, Part 1 April 19, 2010 13.4 21 4.8/13 21.066 1
10.09 Week 5, Part 2 April 20, 2010 8.8 14 2.4/7 13.556 5
10.10 Week 6, Part 1 April 26, 2010 13.2 21 4.4/12 20.404 1
10.11 Week 6, Part 2 April 27, 2010 8.2 13 2.4/7 12.390 10
10.12 Week 7, Part 1 May 3, 2010 12.5 20 4.1/12 19.641 1
10.13 Week 7, Part 2 May 4, 2010 7.8 13 2.4/7 12.043 11
10.14 Week 8, Part 1 May 10, 2010 12.3 19 4.1/11 19.16 3
10.15 Week 8, Part 2 May 11, 2010 8.1 13 2.5/7 12.515 15

text: Dancing with the Stars (U.S. season 10)
Ratings
Ratings
Episode_Number Episode Original_Airdate Rating Share_ Rating_Share_18_49 Viewers_millions Weekly_Rank
10.01 Week 1 March 22, 2010 15.0 23 6.4 24.19 2
10.02 Week 2, Part 1 March 29, 2010 14.4 23 5.6/16 22.966 1
10.03 Week 2, Part 2 March 30, 2010 9.3 15 3.0/9 14.280 5
10.04 Week 3, Part 1 April 5, 2010 13.3 5.1 5.1/14 21.21 2
10.05 Week 3, Part 2 April 6, 2010 8.2 13 2.5/7 12.435 12
10.06 Week 4, Part 1 April 12, 2010 13.2 21 4.9/14 20.56 3
10.07 Week 4, Part 2 April 13, 2010 8.6 14 2.8/8 13.60 6

text: Dancing with the Stars (U.S. season 10)
Ratings
Ratings
Episode_Number Episode Original_Airdate Rating Share_ Rating_Share_18_49 Viewers_millions Weekly_Rank
10.16 Week 9, Part 1 May 17, 2010 12.1 19 4.1/11 19.04 1
10.17 Week 9, Part 2 May 18, 2010 8.6 14 2.5/7 13.19 13
10.18 Week 10, Part 1 May 24, 2010 12.6 21 4.0/12 19.36 3

Question: What is the weekly rank of the 14-share episode "Dancing with the Stars" (US Season 10) whose original airdate was April 20, 2010 in the week-to-week ratings chart?