Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Lil Debbie discography
Table title:
As lead artist
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Title </th><th colspan=1 rowspan=1 > Year </th><th colspan=1 rowspan=1 > Album </th></tr>
<tr> <th colspan=1 rowspan=1 > "Brain Freeze" (with Riff Raff) </th><td colspan=1 rowspan=3 > 2012 </td><td colspan=1 rowspan=1 > Keep It Lit </td></tr>
<tr> <th colspan=1 rowspan=1 > "Gotta Ball" (with V-Nasty) </th><td colspan=1 rowspan=3 > Non-album singles </td></tr>
<tr> <th colspan=1 rowspan=1 > "Michelle Obama" (featuring Riff Raff) </th></tr>
<tr> <th colspan=1 rowspan=1 > "I Do It" (featuring Kool John) </th><td colspan=1 rowspan=3 > 2013 </td></tr>
<tr> <th colspan=1 rowspan=1 > "Ratchets" </th><td colspan=1 rowspan=2 > Queen D </td></tr>
<tr> <th colspan=1 rowspan=1 > "Bake a Cake" </th></tr>
<tr> <th colspan=1 rowspan=1 > "$lot Machine" </th><td colspan=1 rowspan=2 > 2014 </td><td colspan=1 rowspan=1 > California Sweetheart, Pt. 1 </td></tr>
<tr> <th colspan=1 rowspan=1 > "Work the Middle" </th><td colspan=1 rowspan=1 > California Sweetheart Pt. 2 </td></tr>
<tr> <th colspan=1 rowspan=1 > "Me and You" </th><td class="highlighted"  colspan=1 rowspan=3 > 2015 </td><td colspan=1 rowspan=1 > Young B!tch </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > "Lofty" </th><td class="highlighted"  colspan=1 rowspan=1 > Colt 15 </td></tr>
<tr> <th colspan=1 rowspan=1 > "Break It Down" </th><td colspan=1 rowspan=1 > Home Grown </td></tr>
<tr> <th colspan=1 rowspan=1 > "Summer" </th><td colspan=1 rowspan=3 > 2017 </td><td colspan=1 rowspan=1 > OG In My System </td></tr>
<tr> <th colspan=1 rowspan=1 > "2 Cups" </th><td colspan=1 rowspan=2 > Non-Album Singles </td></tr>
<tr> <th colspan=1 rowspan=1 > "Boss Bitch" (featuring Kim Lee) </th></tr>
</table>
Question:
When was the single "Lofty" released?
Answer:
In 2015, Debbie released the single "Lofty" of Colt 45.