Lil Wayne’s ‘Tha Carter IV’ entered the Billboard 200 at #1 last week with an astounding 964K copies sold. However, despite remaining at the top spot, the album exhibited another tremendous shift in sales after exhibiting a whopping 77% sales decrease.

‘Tha Carter IV’ sold over 219K copies in the last 7 days and accumulated a new total of 1.18 million copies as the year’s 3rd highest-selling album in the US after  just 2 weeks. Closely behind at #2 was Adele’s ’21′, which sold yet another 121K units for a sum of 3.42 million copies sold in the US alone as the bestseller of 2011 thus far.

On the Billboard Hot 100, Maroon 5 and Christina Aguilera reclaimed the #1 position with ‘Moves Like Jagger’. Moreover, Rihanna landed has landed her 4th top 10 single on the tally from her ‘Loud’ album as ‘Cheers (Drink To That)’ advanced from #11 to #10.

See the leading Urban/Pop releases from the top 10 of both Billboard 200 and the Hot 100 below:

Billboard 200

1. Lil Wayne – ‘Tha Carter IV’ – 219K (total: 1.18 million)

2. Adele – ’21′ – 121K (total: 3.42 M)

6. The Throne – ‘Watch The Throne’ – 49K (total: 836 K)

9. Beyonce – ’4′ -25K (total: 764K)

Billboard Hot 100

1. Maroon 5 – ‘Moves Like Jagger (Ft. Christina Aguilera)’

2. Adele – ‘Someone Like You’

4. LMFAO - ’Party Rock Anthem (Ft. Lauren Bennett and GoonRock)’

5. Bad Meets Evil – ‘Lighters’

7. Nicki Minaj – ‘Super Bass’

8. Lady Gaga – ‘You & I’

9. Lil Wayne – ‘How To Love’

10. Rihanna – ‘Cheers (Drink To That)’

Thoughts?